Pressure-operated snap switch



June 15 1926.

M. D. DOMINGUEZ l PRESSURE OPERTED SNAP SWITCH 2 Sheets-Sheet 1 OriginalFiled Nov. 22, 1923 @mm Y @idf/f @Hoz n.95

Jung 15 1926.

M. D. DOMINGUEZ Pazssms OPERATED SNAP SWITCH Original Filed NOV' 32,1923 2 Sheets-Sheet 2 Hmmm Patented .lune l5, 1925.

1,588,710 PATENT OFFICE.

UNITED STATES MANUEL D. DOMINGUEZ, OF NEW ORLEANS, LOUISIANA, ASSIGNORTO CHARLES A.

DENIS AND GEORGE SARPY,

BOTH OF NEW ORLEANS, LOUISIANA.

PRESSUREeOPERATED SNAP SWITCH.

Application filed November 22, 1923, Serial No. 676,415. Renewed April6, 1926.

The invention relates to switches, and, has as an object the provisionof a switch which may be operated by fluid pressure. A further object ofthe invention is the provision of a switch which may act automaticallywhen the water faucet is opened, thereby reducing the pressure upon oneside of a valve connected to the switch. A'further object of the ntionis the provision of a switch in ans for supporting the same from thecasing of the valve which operates the switch. A further object of theinvention is the provision of a switch which will have positive means tosupplement the spring which is normally designed to open the switch withsnap action.

Other objects will appear from the following description when read inconnection with the accompanying drawing showing an illustrativeembodiment of the invention, and in which Figure 1 is a vertical centrallongitudinal section through the switch and the valve for operating thesame.

Figure 2 is a plan view of the switch with its cover removed.

Figure 3 is a detail transverse section on line 3 3 of Fig. 1.

A s shown, the switch is adapted to be operated by means of a valvecontained in a valve casing 10, to which water may be conducted by meansof a pipe 11, shown in dotted lines, and from which water may be drawnby means of a pipe 12, also shown in dotted lines, the water flowing inthe direction of the arrow, shown in Fig. 1. The water is adapted toflow through an opening in the partition 13, which partition is normally closed by means of a piston 14 having upwardly extending guidingportions 15 separated by openings at 16 to allow the water to flowthrough the partition 13 when the valve is opened.

To equalize pressure on the two sides of the piston when the faucet, notshown, conneet-ed to pipe 12 is closed, a small opening 17 is providedin a wall of the partition. Wfhen the faucet mentioned is opened, thepressure below the piston 14 will be rcduced, the opening 17 being toosmall to allow the ready escape of water past the partition, and theexcess pressure on the upper side of piston 14 will therefore cause thevalve to open.

The switch operated by the piston 14,

through the piston rod 18, is shown as mounted upon a base plate 19supported by a yoke having a portion 20 perforated to seat over the stem21 of the valve closure and having upwardly extending arms 22, 23secured to the plate, as by means of bolts 24, 25. The circuitcontrolling elements of the s Yitch are shown as mounted upon a block ofinsulation 26, mounted upon the plate 19, and comprise members 27, 2Supon which the switch blades 29, are pivoted, and contacts 31, 32between which the blades 29, 30 of the switch are adapted to pass forcompletion of a circuit.

The pivotal members 27, 28 and the contacts 31, 32 are shown as havingbase members and upwardly projecting portions integral with the basemember, and the base member is shown as secured to the insulating plateby means of screws, two of which are shown in dotted lines in Fig. 1, at33,34.

For connection of the conductors 35, 36, 37, 3S to the switch a bar 39is shown for each of the members 27, 2S, 31 and 32, which bars passbetween the upright portions of the switch element-s referred to, andabove the base members thereof, and have tapped openings to be engagedby the screws 33, 34, thus securing the bars 39 in conductive relationwith the switch elements, and acting as securing members for the switchelements. A binding screw 41 is shown engaging a tapped opening in theprojecting end of each of the bars 39, by means of which the conductorsare clamped to the bars 39. The conductors 35h38 are shown as passingthrough openings in the base plate, which openings are provided withinsulating bushings 42.

To operate the switch blades, there is shown a bar 43 of insulatingmaterial secured between the blades 29, 30, as by means of screws 44,45. The point at which the bar 43 is attached is adjacent to the pivotscrews 46, 47, which mount the switch blades upon the switch elements27, 2S.

To apply power to the bar 43, a yoke 48 is shown formed of base member49, with spaced standards 50, 51, at each end thereof, opposite pairs ofsaid standards being connected at their top, as shown at 52. The yoke isfreely slidable through an opening 53 in the base plate 19 and in theinsulating block 26, and is rigidly secured to the rod 18 as by means oflo-cknuts 54, 55.

Mounted upon a nut 56, secured to the rod 18, there is shown a plate 57having a recess at each corner :t'or co-action with the uprights 5,0,51, the plate being recessed to serve as a seat for a spring 58, whichspring has a second seat in a second plate 59, having an outer torni tocorrespond with plate 57. The end of the rod 18 is shown as projectingabove plate 5T Afor a purpose to be described. To hold the switchnormally open, a spring 60 is shown surrounding the rod 18 and acting incompression against a nut 61 upon the rod and against a washer 62 seatedupon the stutling box closure 68 of the valve.

Zhen the valve is opened the rod 18 will exertV a positive pull upon theyoke d8 through the lock nuts 54, 55, which will act positively upon thebar d3 to close the switch. Ehe lateral movement oi' the bar 43, due toits rotation about the pivot screws 46, e7 is made possible by therelation of the diameter or the bar d3 tothe space between the uprights50, 51. rlhe switch elements 32, 33 are so spaced apart as to exert aconsiderable rictional grip upon the blades 29, 30 ot the switch.rlherei'ore when the faucet controlling the outflow from the pipe 12 isclosed, and the spring 60 is allowed to return thel piston 14: to theclosed position, the blades ot the switch will be retained by thecontact elements until the pressure of spring 58 becomes sut'ricient toovercome the grip, when the switch will be opened with a snap action.

ln the event that the spring 58, is not able to overcome the grip ot thecontact elements upon the switch blades, as in the event that arcingshould slightly weld the parts together, the projecting end of the rod18 will come in contact with plate 59 and give the switch a positivepush to break the adherence. `Whenthus broken the pressure of spring 58.will cause snap action of the switch.

A cover 64: is shown as secured to the base 19 by means of screws 65,engaging ears 66 upon the base plate, and byv means of screws asser/1oG7 engaging ears 68 upon the base plate and depending ears 69 upon thecover. The cover may be open for ins ection by removal of the screwonly, t e cover pivoting about the screws 67, and a handle 70 isprovided i'or ready manipulation ot' the cover. A

Minor changes may be made in the physical embodiment of the inventionwithout departing from its spirit.

l claim z- 1. A pressure operated switch comprising, in combination, avalve, av Vpiston in said valve actuated to open the valve by means of'reduction of pressure upon one side thereof, said valve having arestricted opening tor equalization of pressure when flow through thevalve is stopped, a rod connected with said piston, a yoke carried bysaid rod, a spring acting upon said rod to close said valve, a switchpositively actuated by said yoke when said piston moves to open thevalve, a spring between said yoke and switch resiliently pressing saidswitch towa d open position when said valve is closed by action of saidfirst named spring, and means or positively pressing said switch to.-ward' open position upon full,compression off said second named spring-2. A pressure operated switch comprising, in combination, a valve, apiston in said valve actuated to open the valve by means ot reduction ofpressure upon one side thereot, a yoke carried by said rod, a spring acting upon said rod to close said valve, a switch comprising' a pivotedblade, and spring contacts adapted to grip, said blade when the switchis closed, said yoke: acting positively to. close said switchA whensaid' piston moves to open the valve, a spring hetween said yoke andvswitch, the grip of said spring contacts being suiiicient to4 hold saidswitch closed against the pressure of said last named spring and meansfor positively pressing said switch to an open position upon 'fullcompression ot said last named spring.

MANUEL D. DOIMZNGUEZ.

